Cutter head



May 7, 1929.

L. T` MEDHOLDT' CUTTER HEAD Filed Sept. 17,-1924 2 Sheets-Sheet May 7 1929- L. T. Mr-:DHoLD-r 1,712,087

CUTTER HEAD Filed Sept. 1'7. 1924 2 Sheets-Sheet 2 Hi ll M11 iiliw lumiigid 'zga 5,

yPatented May 7, 1929.

g UNITED STATES- 1,712,087 PATENT OFFICE' Louis r. MEDHOLDT, or nooxronn, ILLINOIs'VAssIGNon To MA'rTIsoN MACHINE WORKS, or noonronn, ILLINOIS, A CORPORATION or ILLINOIS.

CUTTER HEAD.

The invention has general reference to woodworlring machines of the type usually designated mouldersf and the primary aim has been to produce a cutter head of advantageous construction having improved means for vsecuring the head upon. the cutter shaft or spindle.

Moulders as commonly constructed embody side cutterheads mounted to rotate on vertical spindles and top and bottom heads mounted to rotate on horizontal spindles; and the heads are round or square in shape depending upon the character of the workto be operated upon. The horizontal spindles are made of larger diameter than the vertical spindles, so that n cutter heads aspreviously constructed are not susceptible to interchangeability.

One object of my invention is to provide a cutter head with clamping means whereby it may be mounted upon either the vertical or horizontal spindles as desired.

Another objectlis to provide clamping mea-ns for the cutter heads, whereby the heads may be readily secured upon the Vertical spindles of the moulders in a predetermined position thereon. I

A further object is to providek improved clamping means for the cutter heads whereby they may be readily secured upon the hori-r zontal spindles, and which will permit the withdrawal of blade fastening bolts without disturbing the position ofthe cutter head axially of the spindle. The objects of the invention thus set forth and other advantages, are attainedkby the construction and arrangement illustrated in the accompanying drawings and hereinafter fully described, but itis to be understood that I contemplate that various changes in such construction may be made by those skilled in the art without departing from the spirit and scope of the invention as expressed inthe appended claims.

Figure l of the drawings is a side elevational view of a square cutter head secured upon the upper end portion of a vertically disposed spindle such as is employed for sup porting the side cutter in woodworking machinery. I f

Fig. 2 is a vertical sectional view through thesame.

' Fig. 3 `is a plan view of the head.

Fig. 4 is a horizontal sectionalview taken in the plane of line 4 4 of Fig. 2.

Fig. 5 is a perspective view ofa square herein shown) cutterL head equipped with clamping means for fastening it upon a horizontal spindle. Fig. 6 is a side elevation of the same. Figs. 7 and 8 are transverse sectional views taken respectively in the planes of lines 7-7 and 8 8 ofFig. 6.

Fig. 9 is a longitudinal section taken in the i plane Lof line 9-9of Fig. 7.

The cutter head selected for purposes of illustration is of the soecalled square type. lt comprises'a body 5 (Figs. l to 4 inclusive) approximately rectangular in `form and of substantial length. Centrallythereof it is formed with a bore 6 and inV its outer side faces it has under-cut T slots 5a for receiving the heads of bolts 5" whereby the cutter blades (one being shown inl broken lines in Fig. 4) may ber secured. in a well known manner.

Referring first to Figs. 1 to 4,-7 designates the upper end portion of a vertical supporting shaft or spindle. The bore 6 n the head is made of a diameter somewhat greater than the diameter of the spindle toaccommodate the means whereby the head is clamped upon .the spindle.

Said clampingk means comprises a pair of clampingmembers 8 seated respectively in counterbored recesses 9 in the opposite ends of the -body 5. rlhese members are approximately circular in form but have outer pe-y ripheries cut away along lines coinciding .with the bottoms of the T-slots 5a so, as to clear the heads of the blade securing bolts 5b.

To receive the men'ibers 8, the body vis provided at each end with a recess y9 of a depth approximately equal to the length r`of the member; and the membersgare rigidly secured against rotary movement relative to the body y by means of one ormore pins l0 (twobeing The' clamping. members 8 are inthe form of rings split atSa (Fig. yl) and shaped to provide` inner conical bearing surfaces 11 inends ofthe body.; andcoacting with said surfaces ll of the members 8 are similarlyv inclined conical surfaces l2 on ya pair of clampclined inwardly and outwardly'toWa-rd the i i ingmembers 13 andl fitting into'the Amembers 8. Each of said. ring members 13 and y 13 is inthe formofa ring split or severed at oneside, 'as `indicated at 14 andlll', s0 as to capable of contracting when'r forced into its coactin g clamping member 8.

The lower clampingmember 13 is, in the present instance, shown as being formed in the sleeve is clan'iped upon the spindle.

' threaded upper end of the sleeve tegral with a sleeve 15 of a length somewhat greater than the length of the body and of a diameter such as to be capable of passing loosely through the central bore 6 in the body. The upper portion of said sleeve is screwthreaded and the portion projecting from the upper end of the body has mounted thereon a nut 16 which is adapted to engage directly with the clamping ring 13, to -force it .into the conical member 8, the nut operating at the same time through the sleeve 15 to draw the 'clamping ring 13 at the lower end 'of the sleeve into the conically laced member 8 at the lower end of the body. The sleeve 15 is providedL with diametrically opposed slots 17 extending throughout the major portion of the length of the sleeve, the slot 14 in the lower clamping member 13 being continued through the lower end of the sleeve and merged into one of the slots 17. It will thus be seen that as the clamping rings 13 and 13 are forced into their respective bearing members 8 the contraction oi such rings ef- 'tects a like contraction of the sleeve and thus Also, he clamping members 8 are expanded into engagement withtheir recesses 9, so that the body is firmly clamped uponthe spindle. ln order to insure that the sleeve shall clamp the spindle uniformly at opposite ends oit the body, the inner periphery of the sleeve is cut away near its central portion as indicated at 18.

ln addition to the `trictional engagement thus provided between the sleeve and the spindle,y a driving pin 19 may be employed,`

which pin is secured in the lower end ot' the ,sleeve and has its head projecting radially oi the sleeve so as to enter a groove f2() formed in the periphery of the spindle longitudinally' thereof.

rl`he nut 16 is constructed so as to provide means for positioning the cutter head on the spindle and means for locking the clamping means in operative position. Thus it is made .in the 'form of a cap having' a central bore 21 therein, 'terminating short 01"' the upper side ot'thecap so as to form a top wall 22. The lower portion of this bore internallyscrewthreaded as at 9.3 so to coact with the screw A screw 24e is mounted in the top wall 22 of the cap and projects into the bore for engagement i Amembers 8, and the clamping members 13 and 13 and the ends et the sleeve 15.

One side ot the nut- 16 is constructed to Yform an arcuate portion 26 having one end tree so ask to be movable independently of the nut proper after the clamping operation, to ell'ect a locking of the nut in position. This portion 26 is formed by slotting the nut diametrically thereof as shown at 27 and also longitudinally as at 28, the two slots thus formed serving to free the portion 2G from the bodyof the nut so as to render it capable of being turned slightly with a yielding o1 the metal to ellect a locking of the nut on the sleeve.l

To facilitate the manipulation oit the nut 16 it may be provided with the usual radially disposed holes 29 in its periphery to receive a spanner wrench; and the means for operating the arcuate portion 2G comprises, a screw 30 arranged approximately tangentially' ot the nut across the slot 28 and having a squared headll entered in a recess formed in the peripheral face of the nut.

lt will be observed that the nut 1G not only serves to operate the clamping means but it provides in a unitary structure an adjustable sto} i'meniber whereby to facilitate the placing ot the head in proper position on the spindle, and also a means for locking the nut in clamped position. Moreover, it will be seen that to remove the cutter blades from the head it is only necessary to loosen the nuts on the bolts 5b and the bolts may be removed without removing the head by sliding them downwardly out of their lri" slots as is per mitted by the special construction ot the bearing members S. In prior constructions it has been necessary to remove and dis-- assemble the cutter head to permit the removal of the clamping bolts.

Vend ot the head, it being apparent that both ends of the head when horizontally disposed are readily accessible. vEach of these units comprises a pair of coacting clampingmembers 2lb andlf/r. rl`he member Isllf is in the torni of a sleeve fitting over the spindle and entered in a countcrbored recess in the end ot the cutter body 5. At its inner end the sleeve is shaped to provide a conical bearing surface 3G and its outer portion is th read'- ed to receive a clamping nut 37 slit at 237". llhe other clamping member 34.- o each unit is in the i'orm ol a collar fitting over the sleeve Si), and having inwardlyprojecting portions 3l/l shaped at their inner ends to form conical bearing surfaces 38 arranged to coact with the surface 36 on the sleeve. The latter is held against rotation in the body by a pin 239 driven'intothe bottom ot' the recess and adapted toen'gage in a hole 40 in thev inner end of the sleeve. In one side of the sleeve is a slit 4l and equidistantly spaced about the sleeve are a plurality of saw cuts 42 (Fig. 7). This construction permits a contraction of the sleeve onto the spindle. Similarly, the collar 34 is slit at 43 to permit it to expand against the wall of the recess 35. Thus, it Will be seen, by tightening the nuts 37 on opposite ends of the head, the sleeve 33 will be contracted into engagement with the spindle and the collar 34 will be expanded into engagement with the cutter body, effectually clamping the head on the spindle.

As in the case of the vertical spindle, it is desirable that the clamping bolts for the blades be removable Without disturbing or re-y moving' the head. To this end each ot the sleeves 33 and collars 84 are made of a length such that the nuts 37 arespaced some distance from the ends ot the cutter body. Moreover, the inner end of the sleeve is cut away on its peripheral face to form flat sides del disposed substantially flush With the bottoms ot the T-slots 5 (Fig. 7), as are also the peripheral faces ot the collar portions 34 and the periphery of the collar 34 at its outer end, as shown at 45 (Figs. 5 and (l). This renders it possible to remove the clamping bolts by sliding them endwise in their slots 5a, the nuts 37 being spaced far enough from the ends of the body to permit the Withdrawal of the bolt heads as shown in Fig. 5. Consequently, when for any reason a blade is removed from the cutter head, the clamp-` ing bolts thus rendered superfluous can also be quickly and easily removed.

It will be understood that the cutter' bodies when constructed in accordance with my invention may be used either on the vertical spindles or the horizontal spindles at Will, notwithstanding thefact that they vary in diameters. In the 'case of the verticalv the spindle and in this instance, because both` ends of the head are readily accessible, the continuous operating sleeve `l5 may be dispensed with. In either case, the blade fastening bolts may be removed Without removing or disassembling the head.

I claim as my invention:

l. The combination With a spindle, of a cutter head surrounding said spindle and comprising a body havingka central bore extending therethrough, a pair of conically surfaced clamping members mounted in the body at opposite ends thereof, a second pair of complementary conically surfaced clamping membersadapted to engage the .tirst clamp ing members vto effect a contraction of one of said pairs of clamping members onto the spindle, and means for operating the clamp ing members including a nut in the form of a cap having a stop screw adapted to engage the spindle and means tor locking the nut onto one of the clamping members.

2. A cutter head comprising a body, and

means for clamping the body on a spindle including a nut encircling the spindle and having an adjustable axial stop member for ini tially positioning the cutter on the spindle and means including a screw for locking the nut in position.

3. A cutter head comprising, a body, means for clamping the body on a spindle including a nut encircling the spindle and having an` upper end wallv and a movable` side portion, and a stop screw mounted in said Wall and adapted to engage With the upper end of the spindle to position the head thereon, said side portion having means for moving it relative to said top Wall to lock the nut in operative position.

4. A cutter head having a body and means for clamping the body onto a supporting spindle comprising, a pair of clamping members at opposite ends of the body, a threaded sleeve integral with one of said members, and a clamping nut having a top Wall and an independently movable arcuate threaded side portion, and means for forcing said threaded portion into locking engagement with the threaded sleeve.

A cutter head having a body and means for clamping the body onto a supporting spindle comprising, a pair of clamping members at one end of the body one of said members having a threaded portion, and a Aclamping nut having a closed end Wall and an arcuate threaded portion movable into locking engagement With said threaded portion.

In testimony whereof, I have hereunto aflixed my signature.

Louis T MEnHoLDT. 

